Oooo this is really good to know as I was umming and erring about buying a freestyle cup, but knowing that I can pay for individual refills at $1.50 a (soda) pop would suit me just fine, they are big cups for me, and now they have the new cups without any handles, which is obviously in response to the recent locker charge hoo-ha, thats great news.
Also, I'll also have my own refill cup with a screwtop lid, if I want to go on a ride, I'll empty the water from that, pop the soda in it, do the ride, pop the soda back into the refill mug eh voila! I havent had to waste anything I've paid for, great thinkers us Ravenclaws!